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EK19
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PA94,
o
o
PA95
F
F
r
r
o
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m
m
EK19
EK19
4.
Add banana jacks as necessary to complete connections
to external circuits and power supplies.
5. Insert the amplifier into the PCB mounting holes located
in the space between the heatsink fins. So not solder the
pins at this time.
6. Hang the TW13 thermal washer near the end of a 6-32 X
3/8" screw. Slightly pull the amplifier away from the heat
sink face. Use the screw to position the thermal washer
behind the amplifier and insert the screw into the mounting
hole of the heatsink. Use a 6-32 nut to secure the screw
from the opposite side of the heatsink. It is important that
the entire back surface of the amplifiers mounting tab be
in contact with the heatsink. Adjust the amplifiers position
and tighten the mounting screw as necessary for this to
be so.
7.
Solder the amplifiers pins to the PCB.
8. Add other passive components as necessary to complete
your circuit.
9. Most common configurations will ground the non-invert-
ing pin of the amplifier. J1 is a convenient way to do this
if necessary for your application circuit.
10. The four holes at the corners of the circuit board are for
mounting #6 standoff spacers if desired.
11. R1-R5 are multiple feedback resistors in series. Commonly
available resistors do not have a breakdown voltage suf-
ficient to stand off the output voltage of the amplifier. Using
multiple resistors will divide down the voltage that each
resistor must withstand.
Evaluation Kit for PA94, PA95
INTRODUCTION
This easy-to-use kit provides a platform for the evaluation of
linear power amplifiers circuits using the PA94/PA95 pin-out. With
ample breadboarding areas it is flexible enough to analyze a
multitude of standard or proprietary circuit configurations. Criti-
cal connections for power supply bypassing, compensation and
current limiting are pre-wired. Components not usually readily
available in engineering labs are provided. External connection
to the evaluation kit can be made via the terminals at the edge
of the circuit board. These terminal pads are suitable for stan-
dard banana jacks or direct soldering of wires. The schematic
is shown in Figure 1.
PARTS LIST
Part #
HS27
EVAL23
TW13
P6KE440A
CDC01
Description, Vendor
Quantity
Heatsink, Apex Precision Power 1
PC Board, Apex Precision Power 1
Thermal Washer,
1 box, 10 ea.
Apex Precision Power
TransZorb, General
2
Semiconductor (440V)
Capacitor .01µF 1kV,
2
Sprague 5GAS10
ASSEMBLY
1.
2.
3.
See Figures 2 & 3. Insert and solder the TransZorb diodes
at D3 and D4 (440V).
Insert and solder the disc bypass capacitors at C1 and
C2.
Insert the HS27 heatsink and solder the solderable studs
from the opposite side of the PCB.
AUX1
AUX2
FIGURE 1.
Figure 1 shows the schematic of the
evaluation kit's pre-wired connections.
Components supplied with the kit are
marked with an asterisk (*). See the
amplifiers data sheet for full application
information.
IN1
IN2
OUT
-VS
+VS
GND
D3*
440V
C4
R
5
R
4
R
3
R
2
R
1
D4*
440V
C1*
R
LIM
1
D1
D2
2
12
8
R
6
J1
C
C
PA94/95
7
10
6
4
R
C
C2*
EK19U
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Copyright © Cirrus Logic, Inc. 2009
(All Rights Reserved)
MAY 2009
1
APEX − EK19UREVC
P r o d u c t I n n o v a t i o nF r o m
EK19
ContACting CiRRUs LogiC sUPPoRt
For all Apex Precision Power product questions and inquiries, call toll free 800-546-2739 in North America.
For inquiries via email, please contact apex.support@cirrus.com.
International customers can also request support by contacting their local Cirrus Logic Sales Representative.
To find the one nearest to you, go to www.cirrus.com
IMPORTANT NOTICE
Cirrus Logic, Inc. and its subsidiaries ("Cirrus") believe that the information contained in this document is accurate and reliable. However, the information is subject
to change without notice and is provided "AS IS" without warranty of any kind (express or implied). Customers are advised to obtain the latest version of relevant
information to verify, before placing orders, that information being relied on is current and complete. All products are sold subject to the terms and conditions of sale
supplied at the time of order acknowledgment, including those pertaining to warranty, indemnification, and limitation of liability. No responsibility is assumed by Cirrus
for the use of this information, including use of this information as the basis for manufacture or sale of any items, or for infringement of patents or other rights of third
parties. This document is the property of Cirrus and by furnishing this information, Cirrus grants no license, express or implied under any patents, mask work rights,
copyrights, trademarks, trade secrets or other intellectual property rights. Cirrus owns the copyrights associated with the information contained herein and gives con-
sent for copies to be made of the information only for use within your organization with respect to Cirrus integrated circuits or other products of Cirrus. This consent
does not extend to other copying such as copying for general distribution, advertising or promotional purposes, or for creating any work for resale.
CERTAIN APPLICATIONS USING SEMICONDUCTOR PRODUCTS MAY INVOLVE POTENTIAL RISKS OF DEATH, PERSONAL INJURY, OR SEVERE PROP-
ERTY OR ENVIRONMENTAL DAMAGE (“CRITICAL APPLICATIONS”). CIRRUS PRODUCTS ARE NOT DESIGNED, AUTHORIZED OR WARRANTED TO BE
SUITABLE FOR USE IN PRODUCTS SURGICALLY IMPLANTED INTO THE BODY, AUTOMOTIVE SAFETY OR SECURITY DEVICES, LIFE SUPPORT PROD-
UCTS OR OTHER CRITICAL APPLICATIONS. INCLUSION OF CIRRUS PRODUCTS IN SUCH APPLICATIONS IS UNDERSTOOD TO BE FULLY AT THE CUS-
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MERCHANTABILITY AND FITNESS FOR PARTICULAR PURPOSE, WITH REGARD TO ANY CIRRUS PRODUCT THAT IS USED IN SUCH A MANNER. IF THE
CUSTOMER OR CUSTOMER’S CUSTOMER USES OR PERMITS THE USE OF CIRRUS PRODUCTS IN CRITICAL APPLICATIONS, CUSTOMER AGREES,
BY SUCH USE, TO FULLY INDEMNIFY CIRRUS, ITS OFFICERS, DIRECTORS, EMPLOYEES, DISTRIBUTORS AND OTHER AGENTS FROM ANY AND ALL
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